/*
 *   Copyright 2021 zzh
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 *
 */

package com.aduib.boot.common.bytebuddy.exp;

import net.bytebuddy.description.method.MethodDescription;
import net.bytebuddy.implementation.Implementation;
import net.bytebuddy.implementation.bytecode.ByteCodeAppender;
import net.bytebuddy.implementation.bytecode.StackManipulation;
import net.bytebuddy.implementation.bytecode.constant.IntegerConstant;
import net.bytebuddy.implementation.bytecode.member.MethodReturn;
import net.bytebuddy.jar.asm.MethodVisitor;

/**
 * @description: SumMethod
 * @author: zzh
 * @date: 2021/10/19 11:28
 */
public enum SumMethod implements ByteCodeAppender {
    INSTANCE;

    public Size apply(MethodVisitor methodVisitor,
                      Implementation.Context implementationContext,
                      MethodDescription instrumentedMethod) {
        if (!instrumentedMethod.getReturnType().asErasure().represents(int.class)) {
            throw new IllegalArgumentException(instrumentedMethod + " must return int");
        }
        StackManipulation.Size operandStackSize = new StackManipulation.Compound(
                IntegerConstant.forValue(10),
                IntegerConstant.forValue(50),
                IntegerSum.INSTANCE,
                MethodReturn.INTEGER
        ).apply(methodVisitor, implementationContext);
        return new Size(operandStackSize.getMaximalSize(), instrumentedMethod.getStackSize());
    }


}
